Apparatus for treating petroleum oils



Oct. 29, 1929. D DAVID APPARATUS FOR TREATING PETROLEUM OILS Original Filed Feb. 7, 1923 4 127M? for. 11/? 1'72 65 5. flulrql (0:

r f v Patented Oct. 29, 1929 AUBREY 1). DAVID, OF CHICAGO,

ILLINOIS, ASSIGNOR TO 'rrm umvnnsn. on. 2301).-

UCTB COMPANY, OI CHICAGO, ILLINOIS, A CORPORATION OF SOUTH DAKOTA APPARATUS. FOR TREATTNG PETROLEUM OILS v Application This invention relates to improvements in an apparatus for treating petroleum oils, and refers more particularly to the pressure distillation of petroleum hydrocarbons for producing gasoline-like distillates.

Among thev salient objects of the invention are to oil is treated under pressure, vaporized, dephlegmated and subjected to a final condensing action, the refluxed condensate being recycled with the charging stock, although maintained separately during recirculation through the heating zone;'to provide an aparatus whereby a carbon deposition in the iieating stage will be materiallylessned, and an apparatus which will facilitate the cracking of the more refractory reflux in that it is kept separate from the charging stock during the recirculating period.

Fig. 1 is a diagrammatic side elevational View ofthe apparatus with parts broken away. Fig. 2 is a detailed fragmentary view of the construction of the heating tubes.

Referring to the ,drawing, the oil to be treated, is introduced from any convenient extraneous source through the dine 1, controlled by the valve 2, and is circulated through the heating chamber 3 of a side fired furnace 4. It will be noted that" the heating tubes consist of an inner continuous coil 5 through which the charging stock is circulated and an outer tube or casing 6 surrounding the inner tube throughout its travelthrough the heating stage, and through which the reflux condensate is circulated, as will hereinafter be explained. The double tube terminates in a transfer line 7 which is connected to the expansion chamber 8, in which the oils treated in the heating zone are introduced and combined.

The expansion chamber is equipped with try-cocks 9 and residual drawofl' lines 10 controlled by valves 11. The try-cocks serve to permit the operator to ascertainthe liquid level in the expansion chamber, and the residual drawoff pipes are positioned at different levels in the chamber in order to withdraw from time to time or continuously, the unvaporized and'residual products as the carbon provide an apparatus in which the in the tubes with the filed February 7, 1928, Serial No. 817,448. Renewed June 2, 1 927. l

accumulates in the chamber due to the conversion of the oil taking place therein.

Thevapors evolved in the chamber pass off through the line 12, controlled by the valve 1 13, and risethrough'the dephle ating column 14 where they are subjecte to a reflux .ing action. A point fractions are phlegmating' stage in the form of a liquid condensate which is collected in the lower portion of the higherboiling separated out in the deleg 14 while the still vaporized oil constituents pass off through the line 15, regulated by the valve 16to the water condenser 17, and thence through the line 18 regulated by the valve 19 to the distillate receiver 20.

The distillate receiver is equipped with a liquid drawoff valve 21, "a pressure relief valve 22, pressure gauge23, and a liquid level gauge 24. v

The refluxed condensate collected in the lower leg of the dephlegmator may be drawn off through the pipe 25 regulated by the valve 26, and is introduced to the outer casing '6 which surrounds the charging line 1 and heatmg coil 5 through which the charging stock condensate in its,circulation through the casing which surrounds the pipe containing the charging stock, is to transfer its heat to the charging stock, and in its circulation through the furnace to receive the excess heat of the furnace and at the same time transfer suiticient heat to the inner tube to raise the charging stock or raw oil to a conversion temperature. Y

'75 i is circulated. The function of the refluxed.

It is a well knownfact that the refluxed condensate which is recycled through I the heating stage must be raised to higher 'temperhtures to cause conversion than the raw oil charging stock, and further, it is arecognized fact that; when such temperatures are maintained in the furnace they roduce excessive carbon deposition in the tu es, due to the fact, that temperatures suflicient to crack the reflux are excessive for the raw oil, and cause the cracking reaction to take resulting carbon eposition. If however, the reflux is circulated in the casing surrounding the tube conveying the raw oil, these excessive temperatures of as lace I the furnace will serve not only to raise the reflux to a conversion temperature, but will be absorbed thereby, and when properly re ulated will be sufficient not only to raise tfie 5 reflux to a proper temperature, but also to raise the raw oil charging stock to a conyersion temperature without excessive heat? The ,hot liquid reflux surrounding the coil containing the raw oil will prevent this excessive temperature and carbon accumulation in the inner tube.

In Fig. 2 a detail of the construction of the telescopic tubes is shown, and a method of cleaning by removing the plugs shown at 27 in the outer casing and 28 in the inner casing.

I claim as my invention:

1. An apparatus for treating oil, comprising heating tubes,va'porizing, dephlegmating and condensing means, serially connected, means for returning reflux condensate separated out in the dephlegmating'means, the means for recycling the reflux condensate for retreatment, comprising casings surrounding the heating tubes forming an annular space between said tubes and casings, through which the reflux condensate passes, means for combining the heated raw oil and the reflux 3o condensate in said vaporizing means and means for maintaining a regulated pressure upon the apparatus.

2. An apparatus for treating oil, comprising raw oil heating tubes, 2. conversion chamher, a dephlegmator, a condenser and receiver,

means for returning reflux condensate separated out in the dephlegmator, meansfor reheating said reflux condensate comprising tubular casings surrounding said heating tubes forming an annular space through which the reflux condensate passes; means for discharging both reflux condensate and heated raw oil into the conversion chamber to commingle therein and means for continuously withdrawing residual oil from said conversion chamber.

3. An improvement in an oil cracking ap-v paratus comprising inner and outer concentric heating tubes disposed within a furnace,

5 means for supplying a relatively refractory oil from one source to the inlet of the outer tube andv means for supplying a less refractory'oil from a'separate source to the inlet of the inner heating tube, means connected to the outlet ends of the heating tubes for receiving the heated oil, and means for maintaining pressure on the oil supplied to said tubes.

AUBREY D. DAVID. 

